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Answer
Total age =25*30=750 sum of age of 24 retired person age=60 Sum of age of 24 person=750-60=690. Now, Sum of age of new persons=25*29=725 So, New person age=725-690=35 So correct ans is 35.
Answer

 Total age of 25 teachers in a school = (25*30)=750

old teacher retired= 60 years

total age of all 24 teachers = 750-60 = 690

new mean age of 25 teachers = 25

new total age of all 25 teachers = (25*29) = 725

therefore age of new teacher = (725-690) = 35

 

Answer

The answer is 35 years.

Solution: Total age of 25 teachers = (25*30)=750

old teacher retired= 60 years

total age of all 24 teachers = 750-60 = 690

new mean age of 25 teachers = 29

new total age of all 25 teachers = (25*29) = 725

therefore age of new teaher = (725-690) = 35

Answer

The answer is 35 years.

Solution: Total age of 25 teachers = (25*30)=750

old teacher retired= 60 years

total age of all 24 teachers = 750-60 = 690

new mean age of 25 teachers = 25

new total age of all 25 teachers = (25*29) = 725

therefore age of new teaher = (725-690) = 35

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